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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099da2b9b4f3acb1b3bcd28bbc27cceb3057cb1771f99c87c9b68980e3d7ffe1' 
  AND token = 'R7H7+1jb9N3kx2sHKaARG0sO1qS1HqvOvysRbSN6cqk=' 
  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"
    }
  }
}