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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c26d63e69ae823801d602c2e78835be9f1f8c2c1b17f22bbe4f53fca9a70956' 
  AND token = 'l21LBN6v2KDePlQMEC+ec3BcCej/f/Bd7IYESZ56YwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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