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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda93351a8856a571f30bc9e0cc670001e7acc50686358d398c58a83b7d97858' 
  AND token = 'X5o8Bbx0c0dwlq8HokR4lv3hkoms1QZz+aovFBQR9gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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