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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634f1fa0a0291f0521362cac1109ae545271c92d9fd98746aae7007069b52fa7' 
  AND token = 'apFmfosnP/5z+lPUHNnPV5j7xK9pD6iXwKCyUp4O6g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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