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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c2977f0f8ee43fe27e41887b18d6dc3b4b9b003ff626d502fd6f306871bf03' 
  AND token = 'YDmaFWp8RwygE0w9raYmk3GcSkLvLa1a4SBBVXQX5vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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