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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe8e96cfe5f9cf75d32b70f7dd9f44915e88893be8b69b0d31d90db56a435b7' 
  AND token = 'E7fUL83zxODUV2XXkkUP5OKbG3k+ZzvMhBnVLlxGNII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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