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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d2cb31b9e34d3c7254039d8c5839f76bb1ed5874a8f2b518237dabecc63d30' 
  AND token = 'f/rZhp78PG5R8/klbybd4jul2uEBkTxjiXMmg8TFK6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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