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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f51c74bb64e53d676ba2060577454a70503ed80893a3719a201733367ffe13b0' 
  AND token = 'iG8cOSn2mKcxzOvLOJRt8fuMRJz1OsrOOUOcmY7+n9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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