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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38473ad3712124c65df38c7cd53eacbbb96c1a1ee7195a18818916368073d99a' 
  AND token = 'bVORO7+Pz9sO5RkuZ06nefEMeC7/CQw9Z/aFuPNafkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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