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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29303a3efdab0d429c8401f8ef89e8017a48a49e88151cc581a53b9740e5e34c' 
  AND token = 'Lx4cX+XxhqZIqMAkjirL5VJzLNnssNxritcPEXicvwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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