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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b4fb8c46f9ad3eceb0f00e51c2351f8617beb769c653c30fcdf1764e704c7d' 
  AND token = 'gnt+bos+3Xiu1Jm4qcod4/bQ8cBRRziEKsJTv987y7M=' 
  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"
    }
  }
}