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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f230e4c8883dc5325963647f47b296058918525ba5349ac873cd1099f65a93' 
  AND token = 'lUYPfjTl9SHJn+1iEFMOrnb0KG4Ok+H9m1n828dE7vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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