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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceef85da856cb0e5050b603ced7224ee611b3034d6dbb0c70459fbac2293a549' 
  AND token = 'hFtTZwRempVkwslFauRrm+NAOXi0p8lnaJOt3+cs8Lg=' 
  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"
    }
  }
}