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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592cc75ab6f46c5a2103724570086f7ad82d41008e7843f6ccded6c62de7e610' 
  AND token = 'g5ax7T3FXobjihpjJl57RWBDIaBrbMEfcMiswwewwq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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