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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335bca19cfd7aec21f48b8d0936f8afaf77402a48389a74c8d27bc3d9fb1d215' 
  AND token = 'If7mk/GqfectKLpknvJFuvOE5xOlYduxAcD/2+p7f6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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