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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2532750e66b02767bda603b55e6ca089cc5c48cd9f6257f2e746dd0051b903' 
  AND token = 'wkL9i7K//ADcWGi4n68gejRJ6QMIZdCGmL+S16J6B7g=' 
  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"
    }
  }
}