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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6f39270e4fa51527258df78b20f3d9e213db4850cbb93112065f4047f6b88e' 
  AND token = 'FcktyLvqqQSw1I6Plo5dQenRpyO+bi6JLe/T5gRKT18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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