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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11aa5c39012d5849411c6cf8f258a3f958a9f5ee505e4c9669889540bc7d662' 
  AND token = 'OPm8CzC3zSWK4hjeWT9KoqTuou1BePDqtUeGgc6L0Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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