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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7153d0304bc72a58ec8d46189d35b7daecf7ce3ab8807c6965c48e4d4f6b22c' 
  AND token = '77Hzj3+luWHYh6XXeBtB88RhOWr70LZAVKNnVO4eNrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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