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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b86a002e57bea810d5d34dd035626dba8f74fab3962010135c7c965488f468a' 
  AND token = '2VtVAcsf2GQov8CrnXI0y42gSa0MFCbdhQ/z6+FjBPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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