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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b696080deeebe74d8243fff8d98b412f30b470000ee062a9bbe9689e0a06e2' 
  AND token = 'XgOMNnjkjQ8eNW+405r2zAGmy68OScKcMXMCNT04XjA=' 
  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"
    }
  }
}