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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac54fc3d75130bd1a6e8505f1dc74e6bc6c4c0f6f31d1f7e69248f148758f91' 
  AND token = 'huJSpAgTyGk/N9V4q2+ddVVucijehT83Jmty42ZqJus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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