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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d513bd8a9e20fc0dfad70aadf8f6214f43a2d25dbd4ed49c6b5f5e1675139ce' 
  AND token = 'zVMk78VZIkExmaxGqmbgV2SQeCwIoI9//iird2suP0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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