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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc0e631278afe5793fa199c706b3e4f5c220b52e729acb0ac34b61a11bc6678' 
  AND token = 'ZFxmj6Q6pocFpChpFOIonCWSi3G+esKq5CxeFS9AcTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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