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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925f2fd1183daa7496aae72ae40aaebf1de73e2021e5ac1b7364557dce2ed98c' 
  AND token = 'f/ab3GQm16Tl5h6JlAO1Gbn7GoDGgVc25R0zDac7rzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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