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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa957580901a4e2caa5d34b910e9e7f6b4291e8b4269c3aa91ded7d3d87c7ae' 
  AND token = 'GjOTd8T2t/teA4rujfLbhue+P9CxAcdwJrA65lVfz9Y=' 
  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"
    }
  }
}