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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282d35048356fec15d021471ea8d9e9713d5f54c7c84fdc5295b3248fe1af757' 
  AND token = 'ZOsyzQfzF6ciizpAqOV+RhgLUB4cmTndMW7/sAtoPP4=' 
  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"
    }
  }
}