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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4683f677226d0b2ac6889a1a7eb22b71fe1042307104d76c69b4132b8e669b8f' 
  AND token = 'WLjDfz0y21dPq5pX+tB8Oz6iiIF9cKhihgsQebHfJec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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