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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b11c03613de03f7fc7f7e4ffe8ef388f91f21992070cb587d720fcd6abb99' 
  AND token = 'QMd7W2St9xldDuXe5djv1Gk9jVTnVR6m3wOTuzHr0tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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