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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911874740cb29ea2bc32be079168c7eee739f2241e3752dd7c8f50731aaab3ad' 
  AND token = '28DMO1o+N4ASfwDiF4J194gcV3uIpkV1hKo2jcbRjGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}