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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2827dc4fdae07907e3d3b7f0e14704f55fddf8df6067a7b1268b2797bc8d606' 
  AND token = 'brSesfab4zWsn7qLGY1NoWzutIKxaYqfa0i4AKQd32Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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