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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45fe6f1516b66305b363624c9b361547a4b46e05fa8e299ff865937fd1ba058' 
  AND token = 'Vmfbykh3EiBf25I7vm6jfP73HG8/as5ncikGCGcOSwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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