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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b3bed391b2d021a2fb288248b1935034b2af3a67e2ec1b20028f7b6d866bc2' 
  AND token = 'MLvamUgw47vMKM0UqCAGPwTi0NbdEieJxOdqzN5d9qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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