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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec4d71dde310e3cfef252cdce8993eb1be6f4f46897ee142bcfb3c692af711c' 
  AND token = 'IigZl20Rq6SwcIFgSJ2RjEMX7subRLa7akYFEpIRP+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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