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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1528e2bdec72cf2011cc0060f6e3bb5f54d2f859eb8213275b6bbf902dca9dc' 
  AND token = '96iEf6o35rSh+fQJc6IdC5wNdPePUtZqsUHSop8Wf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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