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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114f5a6ab7075f989975b0a36d57df070a5c7c714e7dcb50812ad2a3c661dbdc' 
  AND token = 'ktzXOPOvPCeM4Igd6dGrexw8MmuklkQ6LZIHFweyssg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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