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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6828cbc91b580ff62fa3ee11649379b890dfe86d9fc3420ad7bbea51ae4b449' 
  AND token = 'biYTrUj1TZeVK51o1kz5rNs1p0rlO/wnBxzzybhR/OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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