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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ec611a827c41230e0902418d040a43e30469dab6d22a878d241155e2090860' 
  AND token = 'GK4LBVwiYktO/Q3bvjCNj0458e1CNPgyO8/deR3SwaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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