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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f61a4c619ad9e0b0c4b791ab7272b5656289be1113e01086e161484fa0d7dc' 
  AND token = 'smbwd1tEI/jjMl2pucUAx3sodNm1JAS7dw/geXG7mko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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