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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0092ea2fc92c8e8ed737855c42369ad271da677451dce96e141f2af998b0e92' 
  AND token = 'v/bjomPuM81nJpp9A/c6LWXM4tIY2DthzgOdU/5Lp+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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