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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ab0b48911303513283dadb84a56d22ccff6fc242245e999e11c68d6395dfc1' 
  AND token = 'tB8Xl6Z5Vsy14QBgAgPv8Ul8EqsKRV1PbtFskWQzGWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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