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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5b4c677f996937a217b42f0d0f374ca70208e3747a7d50c856c652e7d5999f' 
  AND token = '+kfF6zNZ9YDqgIC9DGmX0bsS+kPDjFGzvg34O479jPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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