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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d397ec0de754e2d30057ec60763447627655dba8296a6a58d9793a7f173ee19' 
  AND token = 'p55IrAH0XpSfoXh+MIddY36IqKLXSaa25S7+I17mwMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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