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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af17d9a6becf6a0564f28b52a1172de483aa66620e0b56d733426d33ddff3f9' 
  AND token = '9B7RAx7eABrzTV9+7SG8tW4tbZ7VfjUARtqtFbBCV90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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