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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e56991b1ec35c1227cdb366a2eb24e79f88bf57cc2b019807c76fb87e23103' 
  AND token = 'nJ6Iw/sg+KFldD/heUC6ww9Pt7PzCtJ4tnSnGO9N764=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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