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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8a523c91238feb00d1de500bdd2975e8ac5bbe60d2161acb52fd51c55dc074' 
  AND token = '4XFkV9LYAX+yaeDXVc7y1ajM2kueL1Eo8+aMv89WtTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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