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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035c0042acdaa86aca0e8cb7a6a4fa917287b0de4be202e24d5819dcb0b159af' 
  AND token = '7R5rcIiXahkUlLrTHdSAsr5me0cVkn6NtBntalZ8ow0=' 
  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"
    }
  }
}