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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c730fbc95b7d97342c7a72d86bc9eba76ce3b66653d96f36a5a09d7c09c6622' 
  AND token = '+ebIVUy03SLnIBCyhYepmLd+krQ7wUwLuBcYsPhPQ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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