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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e3fc2486bbc0390d5c62ba62ed994474a3170ae7a14fc346d4bd8a3fa60375' 
  AND token = 'kcj1+nNhKEsy0RUg+7PNbE2MsspVY+QvQuHE3oSJrV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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