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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70f19dfcebcc6846a15d328342858ff745c62b5b9c1c9be1d018535674d0fb2' 
  AND token = 'a5bO+OLAAu5xKA/MLlClniMATXhE304FuHgfDrdZXcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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