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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd1b705a7a817f163cf3b04eee320ce215cef899667d658057b7b56fd662005' 
  AND token = 'CTNdUfmVXPN9LjYx78NMEeqcAYOA3xnwhPOF8Phq1pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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