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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b14ff079f01e1a99b058659582d1c8ad7efb05b8d10ee3c324dbfcfb1cfb0bb' 
  AND token = 'U5Oe39d56HRK3SkIh/KKak5gv+0DnseWL4MTBSR0ymQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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