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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a908928f9ebf38a1bbe99204236577b0f8fb14fcd8daac7b20ae212bff8415' 
  AND token = '/oURu5pA2W/RMqL6qnobmM3wKyZ8+Z2Z86ZMYhKFWXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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